This has me thinking. I've got sort of the opposite question. I have two bookings: one for me and one for a colleague. W have exactly the same flights. Both BA flights and AA flights are prime so even flight numbers match exactly too. Wondering if it's possible to link the PNRs and apply a single GUF2. I'm not too fussed as if it doesn't work, then he'll have to slum it in Club.